SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e763b02d7cc27292d50fdc8af91502d9641261e4a802f4f37b551fa58b26fea' 
  AND token = 'IWwXpaqgDvnujiKL4DOhJcJ+R087XA6DxIyhK5R8Mlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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