SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab0a720e896a28467cf51e789f433acd0894db394b5265bdb68f977844b46ced' 
  AND token = 'YFPKBn1nmgDktGkD5khIdMpDOzmduXin8VEbkd/YBT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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