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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa625c0ee9bbaf684410f0639628ce7a2c9521f45f20d3e0a61f4543038a28d2' 
  AND token = 'ZQir46xqXdeRy/AOZMVvjJniws8iqLblUeqmbuArT3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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