SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f49c20028daf3975113be78039264fda817dd07d180641ae2abdd5d4b40d2c0' 
  AND token = 'Fv8g5wxiYeTzJk2haU/dNokA9jTBbsXGBndeu9RPLSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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