SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f9a3fa861408d28f8df78a6fa4ccf9f873b5de9cbdc38f33d3234dbfc338665' 
  AND token = 'GELyeBhdqKwVbrCD03Xbz/UYCOhYnm27rzuXhQ/0Ty8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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