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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '783e70e67ab342d7d6c726ab32fd704d26a9a66d60bdac4b46faf900cba2a279' 
  AND token = 'bFLxFlcerhA3kKiyyag7lSbmQgu++tRC63A1HgEygio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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