SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a578e4d1dfda17c9bcfc28c3193ca99677037fc4cfbd9b14e5bb4d51897f9e8' 
  AND token = 'Sj6pkg2xV8rFyQn54xqGJsRy6CPcLH5RogMaiqCz0GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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