SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebfaa11e8ded917052d52a042ee812e2b6062249f6b6d59877173d078e39652a' 
  AND token = 'RJhOGgT5mKIFG0keua/PLcPY1rA+doQwxhxZYhkMX6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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