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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8ccb487e706c70e181a5501a4b79dbd4700b681097c7b314da8a5c603c07269' 
  AND token = 'gJ9c0TNXToKF+KkbFjZPevnIUgBBfJuK3WZte6vWO/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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