SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29315b7926d100c0c5329371980214f433649a716a1c9837bb1ea44b0fef4fac' 
  AND token = '8XFBf9OGWwYKNS5O9eVT7GczXp0XYEg9L5qnfnYvq8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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