SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26c66f060bee2089ffd4498ec362682665f8a032f666b7952b6c214764736c8b' 
  AND token = 'EEqh1VC3tZuFhtQfhVpPptzaLLgnjKoczVWhB79bO7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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