SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '097741100bbcd17a6fd9916f2368a08abd3c69e3571423aa8c3a50c9007737be' 
  AND token = '2Nmt54jYWELQMtaZi6rQ2gfB//0BL7XvVVL0+CsAK0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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