SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '082fa9e9e7dfa0f2f2d0bcec8f1785768b542afb926356827a31734bdcf95f9d' 
  AND token = 'NpPjNhvl8tWFgOt/fpvYk75bx55B3eqLzUgCMHC1bKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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