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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99d549d77aed828afcadcd6f766691688bd3eb80b95cf117fa67eb6e6c1713fd' 
  AND token = '93bli5wlNVu1A8v4Vyqm1qy5ChaUJ9x3zsEBGzUFb3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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