SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '025336d7ea8b4651e3e466474851251fc4089f32c654051e847f3366840751c5' 
  AND token = 'gBBWPn++8fhmwa0/Vn15NbWgkmJYTzZ9jPi1tTfDnX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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