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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '690a1f037a9280502aa944c99f78d22d361abb318eb90d24b722ffd0a678f82f' 
  AND token = 'kd66RNjfsSX8CWs+48bOE/4wdt3wuovT75aNwAAvdMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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