SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5276503248b58d93d00824fd6015675097de642cf04f5b3db574d03ed441caa' 
  AND token = '0wcADJhHwO2KPVUKFz/fbFDbZ/VFasI9hrDDopB4ie8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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