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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df0ac73a8e7dea1a3d57dd40b1219dd1ecb55648c8e2e5b8e31f5d5f00274ed3' 
  AND token = 'Y/WlDLoNuaIipBpQvey2JzYhBSfTDJOZrtfBbkVbnao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00286

JSON explain

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