SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a53f669b7d4816c874bf8816b3e9de42205e9bc2869550fffc659a2bcc51f6b9' 
  AND token = 'XfQXEbyW3Q5/mKG/i6JyT1rZPdjRHYkoK8elzvF2uDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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