SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6de61c9904240f36067c0f1d87c60ed959d93252c03509a9e645e5f26a145e52' 
  AND token = 'qYNCAjrHdZWzwwHFYyoNHGPy9UBZvvMJ98eVnbvzcgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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