SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47d1c3329e14d8895a7c159d1f9314c5ca6dc58e4907b866a50ae213a5c26781' 
  AND token = 'h8PPliLMCxelH+55WBnnhB/GRGvvK/VM1LO8+qWKzG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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