SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f01dd3d39dffba5d22fc9d4b76b06ae438c46019e8cd4eb6b5f8f27a30fe55a' 
  AND token = 'xlC/eQePmBIJbZ+GlB8Zehr0M9QOwwHKCx1vdvROHzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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