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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0aa191a918ac8770e5623ed3547ea90a638e9d72770512d4c9da56ea18226a73' 
  AND token = 'ijDHxG+y4N9bNz8R4VedPCiB7WBod3qwySlHfKLaboA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}