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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9c592a2b4a08669bd01d57fa6175f8420c4e08bec7a53af4c8349fc7c54281d' 
  AND token = 'VaGxjky4fU2CRAoshmepAqaCcsHH3xaha2xVndyB6L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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