SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '709d4015b84564b1a23b007d20c136fa3472e54356566eef789b380b546721cd' 
  AND token = 'Y2E/zuk6L95/SxTtqyp7LwKvSCyOmYOG2UVq5BYyick=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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