SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6b6b5213432c47a0e3b7d6c633fc12f2368c9226d0656ba0011fd7de73a1562' 
  AND token = '/MWA8y0lLTth+QNn9IR9odFwogaRrxQNLUYEGYZv8ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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