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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c32ba785e164f99c0aa5dce7bd3c38a635844e483f2eaafee56b95d655436d9e' 
  AND token = 'Q/kPqU9XoJvCLL5hpFs6GbVyUBdeUM9J9WwzEe9Txb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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