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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8a7caa1b181e485ea5982ddab280d21ebc2c6dd53cd2127f6c28725d27dd282' 
  AND token = 'AnBMrAwOzc/gxVVLKZBRu7lXjUf61PkDA9IM9BXKt1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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