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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc1c328807869b65d0d8c6aecd5d2ea21cd0b69d7de9b209a67b2dde70206efb' 
  AND token = 'YQHd2HBz537Kd/1sJ6mpls6NygOZDJUmCkbqtghJPno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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