SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '145730ef8970ada5a6b49d87c48145281d16664bfe36d13c64f09f079c7f97c0' 
  AND token = '3pg3kfoKjcayLnQwTAYpEugGc/Mq3YSPi67q1KZ7Rl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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