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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4557612e53d139d2a961b4c105a0fff8df18b2ddf5dc03ae41a284a310db1413' 
  AND token = 'Aab+qfO3e+8UQO2fqmgvWOjdZEiyq5WawPKKwUsQqBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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