SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16320e2305a6e8fc532b63591665a3493671a00b9a3bf25b7a167a0de9d2ee44' 
  AND token = 'Cgzje/4Tdc1KMw2be9VoXN9whkF3+AEdCGCsu15YqOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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