SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ed4a155f5128d77bcccfdf8239be131f217a21c66b1b8d05167e8f194ba54e0' 
  AND token = '4PPl0fjG6SOfhM+xKUAChFWQ24jhixv3cX5wqUij8lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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