SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73c0111ad40c5fb0f9a7182801834d34db5e50b42758ab28f170a20e685658e9' 
  AND token = 'XMOjuhGsaBVzFUe6zAqY/pJB/HTFZ8BLqDCCgH7J9vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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