SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7528bd7dac3b3284c5e6cc7a1e97af59f3ec2ad7d08db42122d623610f0c8a95' 
  AND token = 'h5eWUSqvhvYX34YOzqU0J/8bbTbX1zCWBCoT2+6OAyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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