SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c89526746543018002c154127506385a15aaffc2b1a6e748bcb83972cf582560' 
  AND token = 'kZpnnprDyhAuEnIS71GqtoFJWTxZOzv2X03CxJhwnUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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