Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14136e23016e86c7cb9ce8778aec213279c1b3ca23c87ccf8d7c5de8714c6d49' 
  AND token = 'IIITE1wQOROTb+ePjPVszrdR0PLAP1Hwn2mzwcQM9vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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