SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e13df441d7ed28ab4c9ad85ff6a4d3a6a8731f6e9af1b1f0f77610da033b8ab' 
  AND token = 's+BpB3c9Bz42WSg9wGKmX5jFlm8bauU57kjzxh1ccSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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