SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd923ffa6679ce3fad889221658bf3e4a4ee5e3af9bc9743f69787d5100b5d89' 
  AND token = 'zWpei33NHhIxR264VVpLV/6SbHTOdvPGs2L2RK7B1pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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