SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0177b89f3c0940955c2d99c082a416ab1b7b4e6bf4081281a5209c37a9fd002' 
  AND token = 'KCeX2P/8nAi6ju+LHmSBIhOCUqecrz1aHZjJxM6ozeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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