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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1397eefac57c569cb1fde70d7e41e713754c439a751b230c409bba0b8fd52120' 
  AND token = 'MhnyhEdJxdFuBgLNO3Ak5m04JJr+JylQJ4QbEoUSGHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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