SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8df5a9fb484d28666ff76353c511e1a0b0fe75a5321c056067e87d6cac3ff39a' 
  AND token = 'QzYdq1IlrTF3Tguv5haGhOqvzHRTSI/fk+9MTg/jELk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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