SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed91133199716efe63dae0d64a9038d58eb73b8f5e2298a72b6bbd958bf7718c' 
  AND token = 'jA/xMhoMLOyFGXcRYjm4BSviBhdF4kTHfgmo/lbBRK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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