SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adbd2800d64943e527059df6344519804d9bb63d2cfb1c473f99e692e987998a' 
  AND token = 'ktBBfUIxsNKQbLooGZUxm5JlS0/h8dJO3Sz93JJARow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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