SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6afd25c1e69367d5e4e117d8a01a9f6662198fd8b080bec95074932b87000898' 
  AND token = 'fWoE+jlaX36maMLXTPzMNJTlBhOu5rmCy2FuH2Q7VUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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