SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86857012540fbb90c155e9d94f1920e5d3c50da54eec7a3aabb5f182cdaf100f' 
  AND token = 'i6v3jZ6vQqhGt/IYpfiPCbi7cw/Ej7veld8fLmBdRAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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