SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4a7d0b5ba61bd09101ecf902802db2e79f13cb83820983008300aecf9744b63' 
  AND token = 'tHrDqFJIBEfvZMucDmJ8av8gYe7s/jTGMFPi8LaXOPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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