SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dba08a14bc2c3b667b9291254f95a335d5aca8ef366f9f54edb7d7841c5eebb' 
  AND token = 'Yx6JKXe5sFetti4LpHCndUGVKQaHmgdYN3XACyeqzwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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