SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f144db580d461a9887c0b8f360a0976b89832eb624483e17cf0fa4991c76dec3' 
  AND token = 'BL92v1AVEQoCZ6keg1GYw2+zeR7mjGIN5N9CyHDkSV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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