SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d30f3e3605f7943c6c2bb0f5074a62243c557e243c3c8e9381aec1d8f1de417' 
  AND token = '/yg11fVJwQT0kjFXJzggfAsKLZIoMzy/Wra4Gjj822k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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