SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c05741f81157a0314605f5625cdf9523fb0e1b88370580729c4133e6dd02d529' 
  AND token = '2vrXprJW6rV7H5LCk67z57TckUjqwWHtZMLOdHx/o+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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