SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0075a484b479292cfe83e7c15069d83d6444b223572c09e3244d96cd79d6dffa' 
  AND token = 'LbbOKBuqQALjqhK9/nvzglfEv1bRTRwzpiE3Wxnr7y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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