Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6784c250f4b7e397aef83e3f9699fabb79bd4342f664bce93c6b77dbb3db9c21' 
  AND token = '2xp01XBC0ZCyJNODUkZqs6cqNAM2msqbC6+TxNmaI8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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