SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85697bf09f707699ddf3f9888eb6c489415981c9ee39d5f7432921096d870779' 
  AND token = 'zK4UlFGYDB2nblHM8mhH8+qUw/3IQ1/n5tU3rvqBz0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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